Edit mode
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 - Left mouse button selects objects.

  If you  click on  or  near an object,  it becomes selected,  and all
other  objects  become  unselected.  If  you  hold  down  shift  while
clicking, the object becomes selected (or unselected if it was already
selected), and all other objects remain the same.  If you do not click
near an object, dragging the mouse causes a selection  box to  appear.
Anything within  the selection box when the  mouse is released becomes
selected.  All other  masses become  unselected, unless the shift  key
was held down for the initial click.

  If  any of the "Mass, "Elas", "KSpr", "Kdmp", or "Fixed Mass" values
is  the same for all selected objects, the correspondig gadget  in the
"S&M Settings" group will be updated.


 - Middle Mouse button moves objects (*).

  All selected objects move with the mouse.  The  masses are frozen in
their  positions  after  the  initial click.   They  continue to  move
relative to the mouse movement until the middle button is released.


 - Right mouse button throws objects.
 
  This acts the same way  as  moving objects with  the middle  button,
except for the fact  that the  mouse velocity  is transferred  to  all
selected objects  when  the right  mouse button is released.  Note:  a
good way to stop  an  object from  moving is to  simply select it  and
click the right mouse button.

  Please read the  Window Activaton help page concerning
middle and right mouse button clicks.

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  (*) Users of two button mice may simulate the middle mouse button by
pressing  the  left or right mouse button while holding down any 'alt'
key.